title: Determination of o-phthalic acid in snow and its photochemical degradation by capillary gas chromatography coupled with flame ionization and mass spectrometric detection.
abstract: Phthalic acid and its photochemical degradation has been determined in snow and rainwater samples collected during winters (2003-2010) in the Southeast of Massachusetts using capillary gas chromatography (GC) with flame ionization and mass spectrometric detection. Water samples were dried using a rotary evaporator and derivatized with a 14% BF(3)/methanol reagent before GC analysis. The developed method proved simple and accurate. Phthalic acid was found in snow samples collected in a concentration range of 7.22-76.5 nM. The photodegradation of phthalate was carried out under 300 nm UV light. The direct photodecomposition of the acid is slow (5%h(-1)). However, the addition of dissolved Fe(III) species at 2.0 μM accelerated the light-induced degradation of phthalic acid by 3.5 times in the atmospheric water samples. Photodegradation rates of phthalic acid increases with decreasing pH value of water samples in the range of pH 2.8-4.5.
authors.affiliation: Department of Chemistry and Biochemistry, Universityof Massachusetts Dartmouth, North Dartmouth, MA, USA. yzuo@umassd.edu
authors.forename: Yuegang
authors.initials: Y
authors.lastname: Zuo
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.forename: Jinping
authors.initials: J
authors.lastname: Wu
authors.forename: Bin
authors.initials: B
authors.lastname: Men
authors.forename: Mengchang
authors.initials: M
authors.lastname: He
mesh_terms: D002849:Chromatography, Gas; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D005410:Flame Ionization; D013058:Mass Spectrometry; D055668:Photochemical Processes; D010795:Phthalic Acids / Q000032:analysis* / Q000737:chemistry; D012914:Snow / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C032279:phthalic acid